Brien, I don't know what started you on this rant, but you clearly have no idea what you're talking about. EAA does an exceptional job of keeping the experimental community informed. It is also the personal responsibility of the individual to know and follow the regs, not the job of some external watchdog.
I know of a guy who bought a certificated airplane, flew it over 1,000 hours including into towered airports, and sold it, all without a pilot certificate of any kind. (Then there's Alaska.) The idea that owners of experimentals are more roguish than the rest of aviation has no basis in fact.
Builders who experiment are not rogues, they're using the regulations in the manner they were designed. As noted above, these changes are all allowed under Experimental Amateur Built regs (see the "Experimental" in the name?) as are major airframe changes which alter weight and CG. You notify your FSDO about the change and propose a new Phase I test, and the FAA is free to alter the five-hour duration or the proposed location, but usually won't. Finish testing, make the logbook entry, done.
It always helps your case to start an argument with "you people" or the like. Exactly what type of person flies an experimental aircraft, Brien?
This is the most clueless statement of all. Experimentals receive heavy attention from the FAA, including the individual airworthiness inspection of each aircraft by the FAA or a delegate. The community is currently fighting a proposed new policy document (300 pages long) which would put new limits on E-LSAs and completely prohibit flight over populated areas for all electric-powered aircraft, with no data to support the need for the changes. Like all of aviation, we're constantly fending off "solutions looking for problems."
Brien, it's OK if you just don't like experimentals, but just say so. There's no need to make stuff up.